package com.bowen.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.bowen.common.to.es.SkuEsModel;
import com.bowen.common.utils.R;
import com.bowen.gulimall.search.config.GulimallElaticSearchConfig;
import com.bowen.gulimall.search.constant.EsConstant;
import com.bowen.gulimall.search.feign.ProductFeignService;
import com.bowen.gulimall.search.service.MallSearchService;
import com.bowen.gulimall.search.vo.*;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    private RestHighLevelClient client;

    @Autowired
    private ProductFeignService productFeignService;

    /**
     * 检索的所以参数最终返回所有的结果
     *
     * @param searchParam
     * @return 包含页面所需的所有信息
     */
    @Override
    public SearchResult search(SearchParam searchParam) {
        //1.动态构建出查询需要的DSL语句
        SearchResult result = null;
        //1.准备检索请求
        SearchRequest searchRequest = bulidSearchRequrest(searchParam);


        try {
            //2.执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElaticSearchConfig.COMMON_OPTIONS);

            //3.分析响应数据封装成我们需要的格式
            result = bulidSearchResult(response, searchParam);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return result;
    }

    /**
     * //1.准备检索请求
     *
     * @return
     */
    private SearchRequest bulidSearchRequrest(SearchParam searchParam) {
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        /**
         * 查询部分
         */
        //1.构建bool - query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1 must条件-模糊匹配
        if (!StringUtils.isEmpty(searchParam.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", searchParam.getKeyword()));
        }
        //1.2,bool - filter 按照三级分类id查询的
        if (searchParam.getCatalog3Id() != null) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId", searchParam.getCatalog3Id()));
        }
        //1.2 bool - filter 品牌id进行查询的
        if (searchParam.getBrandId() != null && searchParam.getBrandId().size() > 0) {
            boolQuery.filter(QueryBuilders.termsQuery("brandId", searchParam.getBrandId()));
        }
        //1.2 bool - filter  按照所有指定的属性来查询
        if (searchParam.getAttrs() != null && searchParam.getAttrs().size() > 0) {
            for (String attrStr : searchParam.getAttrs()) {
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                // aattr = 1_5寸:8寸，按照页面发来的请求参数，进行拼接
                String[] s = attrStr.split("_");
                String attrId = s[0];//检索的属性id
                String[] attrValues = s[1].split(":");//这个属性的值
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));
                //每一个必须都要生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                //嵌入式的query怎么查询
                boolQuery.filter(nestedQuery);
            }
        }

        //1.2 bool - filter  按照库存是否有来查询
        if (searchParam.getHasStock() != null) {
            boolQuery.filter(QueryBuilders.termsQuery("hasStock", searchParam.getHasStock() == 1));
        }

        //1.2 bool - filter  按照价格区间
        if (!StringUtils.isEmpty(searchParam.getSkuPrice())) {
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = searchParam.getSkuPrice().split("_");
            if (s.length == 2) {
                //区间
                rangeQuery.gte(s[0]).lte(s[1]);
            } else if (s.length == 1) {
                if (searchParam.getSkuPrice().startsWith("_")) {
                    rangeQuery.lte(s[0]);
                }
                if (searchParam.getSkuPrice().endsWith("_")) {
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }

        //把以前的所有条件进行封装
        sourceBuilder.query(boolQuery);


        /**
         * 排序，分页，高亮
         */
        //2.1 排序
        if (!StringUtils.isEmpty(searchParam.getSort())) {
            String sort = searchParam.getSort();
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0], order);
        }
        //2.2 分页
        // pageNum:1 from:0 size:5 [0,1,2,3,4]
        // pageNum:2 from:5
        // from= (pageNum -1 )* size
        sourceBuilder.from((searchParam.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3高亮 只有传了keyword才高亮
        if (!StringUtils.isEmpty(searchParam.getKeyword())) {
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:blue'>");
            builder.postTags("</b>");

            sourceBuilder.highlighter(builder);
        }

        /*
        聚合
         */

        //j.1 按照品牌聚合
        TermsAggregationBuilder brandId = AggregationBuilders.terms("brand_agg").field("brandId").size(50);
        TermsAggregationBuilder brandName = AggregationBuilders.terms("brand_name_agg").field("brandName").size(1);
        TermsAggregationBuilder brandImg = AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1);
        brandId.subAggregation(brandImg);
        brandId.subAggregation(brandName);
        sourceBuilder.aggregation(brandId);

        //j.2 按照分类进行聚合
        TermsAggregationBuilder catalogId = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        TermsAggregationBuilder catalogName = AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1);
        catalogId.subAggregation(catalogName);
        sourceBuilder.aggregation(catalogId);


        //j.3 按照属性进行聚合
        NestedAggregationBuilder nested = AggregationBuilders.nested("attr_agg", "attrs");
        TermsAggregationBuilder attrId = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        TermsAggregationBuilder attrName = AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1);
        TermsAggregationBuilder attrValue = AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50);
        attrId.subAggregation(attrName);
        attrId.subAggregation(attrValue);
        nested.subAggregation(attrId);
        sourceBuilder.aggregation(nested);
        String s = sourceBuilder.toString();
        System.out.println("构建的DSL" + s);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);

        return searchRequest;
    }

    /**
     * 构建结果数据
     *
     * @return
     */
    private SearchResult bulidSearchResult(SearchResponse response, SearchParam searchParam) {
        SearchResult result = new SearchResult();
        //1.返回的所有查询到的商品
        SearchHits hits = response.getHits();

        List<SkuEsModel> esModels = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(searchParam.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                esModels.add(esModel);
            }
        }
        result.setProducts(esModels);

        //2.当前所有商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attrAgg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attrIdAgg = attrAgg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attrIdAgg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //1.得到属性的id
            Long attrId = bucket.getKeyAsNumber().longValue();
            //2.得到属性的名字
            ParsedStringTerms attrNameAgg = bucket.getAggregations().get("attr_name_agg");
            String attrName = attrNameAgg.getBuckets().get(0).getKeyAsString();
            //3.得到属性的值
            ParsedStringTerms attrValueAgg = bucket.getAggregations().get("attr_value_agg");
            List<String> attrValues = attrValueAgg.getBuckets().stream().map(item -> {
                String keyAsString = item.getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);

            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);
        //3.当前商品所涉及的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brandAgg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brandAgg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //1.得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            //2.得到品牌的名字
            ParsedStringTerms brandNameAgg = bucket.getAggregations().get("brand_name_agg");
            String brandName = brandNameAgg.getBuckets().get(0).getKeyAsString();
            //3.得到品牌的图片
            ParsedStringTerms brandImgAgg = bucket.getAggregations().get("brand_img_agg");
            String brandImg = brandImgAgg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandId(brandId);
            brandVo.setBrandName(brandName);
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);
        //4.当前商品所涉及到的所有分类信息
        ParsedLongTerms catalogAgg = response.getAggregations().get("catalog_agg");
        List<SearchResult.cataLogVo> cataLogVos = new ArrayList<>();
        for (Terms.Bucket bucket : catalogAgg.getBuckets()) {
            //得到分类id
            SearchResult.cataLogVo cataLogVo = new SearchResult.cataLogVo();
            cataLogVo.setCatalogId(Long.parseLong(bucket.getKeyAsString()));

            //得到分类名
            ParsedStringTerms catalogNameAgg = bucket.getAggregations().get("catalog_name_agg");
            String catalogName = catalogNameAgg.getBuckets().get(0).getKeyAsString();
            cataLogVo.setCatalogName(catalogName);
            cataLogVos.add(cataLogVo);
        }
        result.setCataLogs(cataLogVos);
        //分页信息的-页码
        result.setPageNum(searchParam.getPageNum());
        //分页信息的-总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        //分页信息的-总页码-计算
        int totalPage = (int) Math.ceil(total / (float) EsConstant.PRODUCT_PAGESIZE);
        result.setTotalPage(totalPage);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPage; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //构建面包屑导航功能
//        List<SearchResult.NavVo> navVos = new ArrayList<>();
        if (searchParam.getAttrs() != null && searchParam.getAttrs().size() > 0) {
            List<SearchResult.NavVo> collect = searchParam.getAttrs().stream().map(attr -> {
                //1.分析每个attrs传过来的查询参数值。
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {
                    });
                    navVo.setNavName(data.getAttrName());
                } else {
                    navVo.setNavName(s[0]);
                }
                //2.取消了这个面包屑后，我们要跳转到那个地方，将请求地址的url地址里面的筛选条件清空替换掉
                //拿到所有的查询条件，去掉当前；
                String replace = replaceQueryString(searchParam, attr, "attrs");
                navVo.setLink("http://search.bowen.com/list.html?" + replace);

                return navVo;
            }).collect(Collectors.toList());

            result.setNavs(collect);
        }

        //品牌分类
        if (searchParam.getBrandId() != null && searchParam.getBrandId().size() > 0) {
            List<SearchResult.NavVo> navs = result.getNavs();
            if (navs == null) {
                navs = new ArrayList<>();
            }
            SearchResult.NavVo navVo = new SearchResult.NavVo();

            navVo.setNavName("品牌");
            R r = productFeignService.brandsInfo(searchParam.getBrandId());
            if (r.getCode() == 0) {
                List<BrandEntity> brandEntityList = r.getData("brand", new TypeReference<List<BrandEntity>>() {
                });
                List<BrandVo> brand = brandEntityList.stream().map(item -> {
                    BrandVo brandVo = new BrandVo();
                    brandVo.setBrandId(item.getBrandId());
                    brandVo.setBrandName(item.getName());
                    return brandVo;
                }).collect(Collectors.toList());
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getBrandName() + ";");
                    replace = replaceQueryString(searchParam, brandVo.getBrandId() + "", "brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.bowen.com/list.html?" + replace);
            }
            navs.add(navVo);
        }

        return result;
    }

    private String replaceQueryString(SearchParam searchParam, String value, String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            encode.replace("+", "%20");//浏览器对空格的编码和java不一样
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return searchParam.get_queryString().replace("&" + key + "=" + encode, "");
    }


}
